31223310121 has 4 divisors (see below), whose sum is σ = 31651026772. Its totient is φ = 30795593472.

The previous prime is 31223310119. The next prime is 31223310163. The reversal of 31223310121 is 12101332213.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12101332213 = 15641 ⋅773693.

It can be written as a sum of positive squares in 2 ways, for example, as 18567060121 + 12656250000 = 136261^2 + 112500^2 .

It is a cyclic number.

It is not a de Polignac number, because 31223310121 - 2¹ = 31223310119 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (31223310821) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 213858216 + ... + 213858361.

It is an arithmetic number, because the mean of its divisors is an integer number (7912756693).

Almost surely, 2^31223310121 is an apocalyptic number.

It is an amenable number.

31223310121 is a deficient number, since it is larger than the sum of its proper divisors (427716651).

31223310121 is an equidigital number, since it uses as much as digits as its factorization.

31223310121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 427716650.

The product of its (nonzero) digits is 216, while the sum is 19.

Adding to 31223310121 its reverse (12101332213), we get a palindrome (43324642334).

The spelling of 31223310121 in words is "thirty-one billion, two hundred twenty-three million, three hundred ten thousand, one hundred twenty-one".